fix: Reset dimension properties when defining new circle

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/CircleTool.cpp

@@ -40,6 +40,12 @@ void CircleTool::mousePressEvent(QMouseEvent *event)
         }
         m_centerPoint = p;
         m_isDefining = true;
+
+        m_dimensionModes.clear();
+        m_dimensionModes << "diameter";
+        m_dimensionPropertyNames.clear();
+        m_dimensionPropertyNames["diameter"] = "diameterInput";
+
         m_viewport->setProperty("diameterInput", "");
         m_viewport->setProperty("dimensionEditMode", "diameter");
     } else {